shadow vulnerabilities

5 May 2017

shadow vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 17.04
• Ubuntu 16.10
• Ubuntu 16.04 LTS
• Ubuntu 14.04 LTS

Summary

su could be made to crash or stop programs as an administrator.

Software Description

• shadow - system login tools

Details

Sebastian Krahmer discovered integer overflows in shadow utilities. A local attacker could possibly cause them to crash or potentially gain privileges via crafted input. (CVE-2016-6252)

Tobias Stöckmann discovered a race condition in su. A local attacker could cause su to send SIGKILL to other processes with root privileges. (CVE-2017-2616)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 17.04

login - 1:4.2-3.2ubuntu1.17.04.1

passwd - 1:4.2-3.2ubuntu1.17.04.1

uidmap - 1:4.2-3.2ubuntu1.17.04.1

Ubuntu 16.10

login - 1:4.2-3.2ubuntu1.16.10.1

passwd - 1:4.2-3.2ubuntu1.16.10.1

uidmap - 1:4.2-3.2ubuntu1.16.10.1

Ubuntu 16.04 LTS

login - 1:4.2-3.1ubuntu5.2

passwd - 1:4.2-3.1ubuntu5.2

uidmap - 1:4.2-3.1ubuntu5.2

Ubuntu 14.04 LTS

login - 1:4.1.5.1-1ubuntu9.4

passwd - 1:4.1.5.1-1ubuntu9.4

uidmap - 1:4.1.5.1-1ubuntu9.4

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

• CVE-2016-6252
• CVE-2017-2616